Use only visible flags

Signed-off-by: Sascha Grunert <mail@saschagrunert.de>

go.mod

@@ -4,7 +4,7 @@ go 1.11
 
 require (
 	github.com/BurntSushi/toml v0.3.1
-	github.com/antzucaro/matchr v0.0.0-20180616170659-cbc221335f3c
+	github.com/antzucaro/matchr v0.0.0-20191224151129-ab6ba461ddec
 	github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d
 	gopkg.in/yaml.v2 v2.2.2
 )

go.sum

@@ -1,7 +1,7 @@
 github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/antzucaro/matchr v0.0.0-20180616170659-cbc221335f3c h1:CucViv7orgFBMkehuFFdkCVF5ERovbkRRyhvaYaHu/k=
-github.com/antzucaro/matchr v0.0.0-20180616170659-cbc221335f3c/go.mod h1:bV/CkX4+ANGDaBwbHkt9kK287al/i9BsB18PRBvyqYo=
+github.com/antzucaro/matchr v0.0.0-20191224151129-ab6ba461ddec h1:uurd2LiNfcarvGB05LUzvGzPoNr5eRgC92WwdXoK7Qs=
+github.com/antzucaro/matchr v0.0.0-20191224151129-ab6ba461ddec/go.mod h1:v3ZDlfVAL1OrkKHbGSFFK60k0/7hruHPDq2XMs9Gu6U=
 github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d h1:U+s90UTSYgptZMwQh2aRr3LuazLJIa+Pg3Kc1ylSYVY=
 github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=

suggestions.go

@@ -14,13 +14,13 @@ func (a *App) suggestFlagFromError(err error, command string) (string, error) {
 		return "", err
 	}
 
-	flags := a.Flags
+	flags := a.VisibleFlags()
 	if command != "" {
 		cmd := a.Command(command)
 		if cmd == nil {
 			return "", err
 		}
-		flags = cmd.Flags
+		flags = cmd.VisibleFlags()
 	}
 
 	suggestion := a.suggestFlag(flags, flag)